Features of genetic algorithm for plain text encryption

International Journal of Electrical and Computer Engineering (IJECE)
Vol. 11, No. 1, February 2021, pp. 434~441
ISSN: 2088-8708, DOI: 10.11591/ijece.v11i1.pp434-441  434
Journal homepage: http://ijece.iaescore.com
Features of genetic algorithm for plain text encryption
Riyadh Bassil Abduljabbar, Oday Kamil Hamid, Nazar Jabbar Alhyani
Department of Computer Techniques Engineering, Dijlah University College, Iraq
Article Info ABSTRACT
Article history:
Received Apr 24, 2020
Revised Jun 15, 2020
Accepted Aug 5, 2020
The data communication has been growing in present day. Therefore,
the data encryption became very essential in secured data transmission and
storage and protecting data contents from intruder and unauthorized persons.
In this paper, a fast technique for text encryption depending on genetic
algorithm is presented. The encryption approach is achieved by the genetic
operators Crossover and mutation. The encryption proposal technique based
on dividing the plain text characters into pairs, and applying the crossover
operation between them, followed by the mutation operation to get
the encrypted text. The experimental results show that the proposal provides
an important improvement in encryption rate with comparatively high-speed
processing.
Keywords:
Crossover
Genetic algorithm
Mutation
Plain text
Text encryption This is an open access article under the CC BY-SA license.
Corresponding Author:
Riyadh Bassil Abduljabbar,
Department of Computer Engineering Techniques,
Dijlah University College,
Baghdad, Iraq.
Email: riyadh.bassil@duc.edu.iq
1. INTRODUCTION
Cryptography field has been attracted a lot of concern especially in network security. Internet
popularity and its usage increases due and to the exponential increase in the security needs for
the transactions ine-commerce field [1]. In addition to risks which involved regarding the communication of
raw data via the Internet. High and importance gain could be provided by data integrity, non-repudiation,
confidentiality, and authenticity which become more important component in the security of information
[2, 3]. The best solution for keeping safe data transfer is the use of cryptography as a technique
for encrypting and decrypting messages soany body can not interpret it, only the message sender and
the receiver can. Consequently, data encryption has become an inevitable and integral part of any application
in e-commerce [4-6]. Therefore, it is very important to encrypt data using a robust and fast encryption
algorithm in order to make sure of secret transmission and data delivery to protect it from any intruder.
In general, the concept of encryption techniques is converting the plain text to cipher text before storage or
transmission [7-10]. The Genetic algorithm properties (mutation, crossover and selection) have been
exploited by many researchers for data encryption optimizing and searching problems through generating
typical solutions [11, 12]. This paper introduces new method for data encryption based on the Genetic
algorithm operators (Crossover and mutation) with a varying crossover and mutation points of indexs
between character pairs.
The outline of this paper is ordered: Section 1 focoused on the work review. The suggested
technique is described in section 2. The experimental results and encryption analysis are highlight in
section 3. Finally, conclusion is showed in section 4. In Cryptography, many researches have been done to
enhance the genetic algorithm. Jhingran and Vikas [13] presented Studies on cryptography techniques using

Int J Elec & Comp Eng ISSN: 2088-8708 
Features of genetic algorithm for plain text encryption (Riyadh Bassil Abduljabbar)
435
genetic algorithm. In which, cryptography system is proposed by utilized thegenetic algorithm and
public key. In 2014, Sindhuja and Pramela [14, 15] introduced a symmetric key for message encryption
and decryption. The length of secret key is concerned with number point of both crossover and
mutation processing.
Srikanth and Noha proposed mutation and crossover operations of genetic algorithm with
pseudorandom function for data encryption [16]. To increase the robustness of the secret key, Nazeer and
Ghulamo, suggests genetic algorithm with random number generator to introduce a secret key. The raw
data is diffused by crossover and mutation. Finally, the diffused data and key are undergoing to logical
operations [17]. In 2019, Alsadig and Mandour [18] have proposed a text encryption using genetic algorithm.
The secret key is generated by exploit the crossover and mutation. Then, the permutation factor generated
randomly. Subsequently, the secret key and the permutation factor are applied to the plain text.
Shafiul and Sabir also proposed genetic algorithm combined with fitness function for text
encryption, in which the crossover and mutation operations are combined with a random function generator
for best key generation [19]. Afigha and Sofia [20] suggested security improvement to randomness of
security key unexpected based on crossover and mutation features of genetic algorithm. The results show that
the generated secret key is most randomness and unpredictable by the intruder.
In order to protect and secured data in cloud computing, Amitha and T.R suggested algorithm called
DSLA, in which a private key is used to investigate the user reliability [21]. The IOT (Internet of Thing) is
a device useful for communicate and exchange information between computerize schemes. Rubesh and
kirybanand presented a proposal to increase the security level between IOT and clients by integrate the public
key, asymmetric and symmetric cryptography system [22].
In 2020, Nedal.and Ashraf, introduced a combine chaotic map with RSA algorithm to improve
security level of RSA key. The results show that the security level of new approach is enhanced compared
with RAS public key standalone and reduced the computational processing time [23]. The main security of
WSN established on key distribution between nodes. Jyothi and Nagarai defines a new method for key
distribution within WSN based on ECC. The proposal reshuffling the ECC public key by utilized Arnold
map. The result show that the suggestion can be applied on poor recourse communication system [24].
Several ciphers have been developed to text encryption. Oday and nazar in 2019, described cipher algorithm
for text encryption. The encryption implements Pascal matrix and inverse Pascal matrix preformed for
decryption processing [25].
2. RESEARCH METHOD
The proposed algorithm is divided into two main processes, the encryption process and
the decryption process each onedepends on genetic operators to implement the encryption and
decryptionwith the aid of character pairs technique.
2.1. Encryption process
As shown in Figure 1, encryption process can be characterized starting from reading the plain text
message, converting the text characters into binary form after taking its equivalent Unicodevalues. The first
generation is produced when crossover operation is implemented between the binary pairs (crossover index
(1) is used for the first pair (1) for the second pair (3) for the third pair till (8) for the eighth pair and the cross
over is restarted to (1) for the nineth pair and so on. Mutation point is applied to the resulted generation
(mutation index (1) is used for the first pair (1) for the second pair (3) for the third pair till (8) for the eighth
pair and the cross over is restarted to (1) for the nineth pair and so on. Ciphered text is produced after getting
the equivalent characters according to ASCII table. The methodology of the encryption process is illustrated
in Figure 1.
2.2. Decryption process
The decryption method is shown in Figure 2, and described as follows, at the receiver part
the receiver will receive the encrypted text that consists of two parts the first part is (Parent1) and the second
part is (Parent2). Both (Parent1) and (Parent2) characters are converted to its equivalentuincodevaluesand
then to their equivalent binary form of byte length. Mutation operation is implemented on (Parent1) and
(Parent2)(mutation index (1) is used for the first pair (1) for the second pair (3) for the third pair till (8) for
the eighth pair and the cross over is restarted to (1) for the nineth pair and so onthe result is (Child1 &
Child2). Crossover operation is donebetweenthe (Child1) and (Child2)(crossover index (1) is used for
the first pair (1) for the second pair (3) for the third pair till (8) for the eighth pair and the cross over is
restarted to (1) for the nineth pair and so onto get theoriginalplain text. The methodology of the decryption
process is illustrated in Figure 2.

 ISSN: 2088-8708
Int J Elec & Comp Eng, Vol. 11, No. 1, February 2021 : 434 - 441
436
Figure 1. Flow chart of the encryption process
Figure 2. Flow chart of thedecryption process
3. RESULTS AND DISCUSSIONS
All the expermints have been preformed in MATLAB version 10 and achivied on Intel core i5
processor (2.4) GHz and RAM (8) GB.
3.1. Encrypting an English text message
The proposal encryption structure as shown in Figure 3 and defined as follows:

437
At first the English plain text message to be encrypted using the proposed technique is read by using
(text read) Matlab instruction. The plain textthatenterd to the program is "Very secret message" so the plain
text message contains (19) characters. The encryption process for the plain text message is illustrated in
the below steps:
1: Read the plain text message that is saved in a (.txt) file.
2: Calculate the length of the plain text (L=19)
3: Initialize character pair index (i=1)
4: Mutation point = 1; Crossoverpoint=1
5: If i=L then input (ChL& Ch1) Else input (Chi & Chi+1)
6: Gettheunicodefor each character.
7: Convert the unicodevaluesinto its equivalent binary form of (8-bit) length
8: Do single point Crossover operation of index (i) betweenthe pairs of indexs (i& i+1)
9: Mutate the result (Child1(i)) & (Child2(i)) using Mutation point index (i)
10: Get the (char) of the Mutation operation result
11: Ciphered character of index (i) is produced
12: Increment the variable (i) by one (i=i+1)
13: If (i>19) Then Ciphered text is completedElse (Crossover point= Crossoverpoint+1);
Mutation point = Mutation Point+1
14: If Crossover point& Mutation point> 8 Then (Crossoverpoint =1; Mutationpoint =1)
15: Check If i=19Then input the characters pair of indexes of (19&1) hence (Ch19, Ch1)
DoSteps (6-14) Else Do Steps (6-15)
The result is the encrypted text which is “dp}x3Q%ٍdvd%}G3‫ل‬fgR” is sent along with (Child2).
The result which is “Wgv!`G#‫م‬sg0huQ3ٍ`ea” after running the Matlab program are illustrated in
the Figure 3.
Figure 3. Program run results

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3.2. Decrypting an English text message
The decryption steps and the results are summarized in Figure 4, and demonstrated as follows:
At the receiver end the receiver will receive the encrypted text“dp}x3Q%ٍdvd%}G3‫ل‬fgr” which is
considered as (Parent1) along with “Wgv!`G#‫م‬sg0huQ3ٍ`eA”which is considered as (Parent2) this encrypted
text message is read by using (text read) Matlabinstruction. The encryption process for the plain text message
is illustrated in the below steps:
1: Read theencryptedplain text message (.txt) file.
2: Calculate the plain text length (L=38), which is equal to ((Recived text length)/2) = (38/2) =19
4: Initialize character pair index (i=0)
5: Initialize the Crossoverpoint (Crossoverpoint=1)
3: Initialize Mutation point (Mutation point =1)
7: Input the characters pair (Parent1(i), Parent2(i))
8: Gettheunicodefor each character.
9: Convert the unicode values into its equivalent binary form of (8-bit) length
10: Do mutation operation of index (i) between (Parent1 (i) & Parent2(i)).
11: The Mutation operation result is (Child1(i) &Child2(i))
12: Do single point Crossover operation of index (i) between (Child1(i) &Child2(i))
13: Plain textcharacter of index (i) is produced
14: Increment the variable (i) by one (i=i+1)
15: If (i>19) Then Plain text is completed Else
(Crossover point= Crossoverpoint+1); Mutation point=Mutation point+1)
16: Crossover point= Crossoverpoint+1; Mutation point=Mutation point+1
17: If Crossover point& Mutation point> 8 Then (Crossoverpoint =1; Mutation point=1)
18: DoSteps (7-18)
Figure 4. Program run results

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3.3. Execution time
Generally, the standard cipher AES, DES and RSA are more scure. On the other hand, have high
computional cost to very large data files encryption [26]. In this approach, the compution time analysis has
been performed for five different data file size as shown in Table 1. From Table 1 and Figure 5 it can be
shown that the results of the proposal outperformed the RAS and DES in the execution time term.
Undoubtedly, the computional cost proportional inverse with file size.
Table 1. Comparison between the proposed work and other traditional encryption algorithms
Data Encryption Standard RSA Algorithm
Text Pair Genetic
(Proposed Work)
Text Size (Kilobyte)
2.553 sec 5.6373 sec 1.636 sec 10 KB
6.865 sec 11.274 sec 5.980 sec 20 KB
11.652 sec 16.912 sec 9.175 sec 30 KB
15.175 sec 22.549 sec 13.361 sec 40 KB
19.719 sec 28.186 sec 16.557 sec 50 KB
Figure 5. Encryption time of the approach, [RSA] and [DES] algorithms
3.4. Throughput
The calculation of Throughput is preformed by dividing the sum of the input files sizes to the time
consumed by the encryption process as illustrated in (1). The comparison results between GA, DES and
RSA is shown in Tables 2 and 3. As shown in previous tables, the GA achieved reasonable throughput
compared with DES and RSA. Throughput (Kilobyte/Second) = SUM. (Input text file size)/SUM.
(Encryption execution time)
Table 2. Comparison of encryption throughput of the proposed work [GA] and DES, RSA algorithms
Encryption Algorithm
File Size
(KB)
Encryption Throughput
(KB/Sec.)
Proposed work [GA] 225KB 4.0229
DES [6] 225KB 3.3011
RSA [6] 225KB 2.6608
Table 3. Comparison of encryption throughput of the proposed work [GA] and DES, RSA algorithms
Text File Size
(Kilobyte)
100KB Algorithm Throughput (Kilobyte/Second)
100KB RSA 1.228 Seconds
100KB Data Encryption Standard 1.963 Seconds
0 5 10 15 20 25 30
10
15
20
25
30
35
40
45
50
Text Size (Kilobyte)
Execution
Time
(Second)
Data Encryption Standard
RSA Algorithm
Genetic (TextPair)

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4. CONCLUSION
In this paper, encryption approach for ciphering Arabic text using genetic algorithm operators has
been proposed. This approach is Simple and easy to implement in cryptographic system because it depends
on two basic operations the crossover and mutation. In this proposal, Genetic operator algorithms, encryption
and decryption processes are achieved in acceptable security level in both transmission and receiving end,
due to the use of crossover and mutation operations in which binary and decimal conversions increase
the strength of encryption approach. On other hand, the computational time of this approach is relatively high
compared with other traditional cryptography schems like DES and RSA algorithms. Numerous expansions
of the suggestion could be projected in the upcoming time like enhancing the security level of encryption by
using chaotic logistic map. Secondly, implement it for multimedia encryption.
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BIOGRAPHIES OF AUTHORS
Riyadh Bassil Abduljabbar received his Bsc. Eng. and M.D. Eng. in Computer and Control
Engineering from University of Baghdad Iraq in 2000 and 2003 respectivelt. Currently, he is a
senior lecturer in the Faculty of Computer Engineering Techniques at Dijlah University College
Iraq (DUC). His research interests include Data Security, Networking, Cluod Security, Computer
Architecture.
Oday Kamil Hamid received his Bsc. in Electrical Engineering and M.D. Eng in
Communication Engineering from University of Technology Iraq in 2000 and 2003 respectively.
Currently, he is a senior lecturer in the Faculty of Computer Engineering Techniques at Dijlah
University College Iraq (DUC). His research interest, communication, security, digital signal
processing, speech recognition, neural network.
Nazar Jabbar Alhyani received his PhD of Science in Electronic Engineering from University
of Buckingham - UK in 2015. Currently, he is a university staff at Dijlah University College Iraq
(DUC). His research interests include secure transmission, video encryption and compression,
cloud security and data encryption.

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